code: def compile(self, ttFont):
      keys = sorted(self.data.keys())
      headerSize = sstruct.calcsize(META_HEADER_FORMAT)
      dataOffset = headerSize + len(keys) * sstruct.calcsize(
          DATA_MAP_FORMAT
      )
      header = sstruct.pack(
          META_HEADER_FORMAT,
          {
              "version": 1,
              "flags": 0,
              "dataOffset": dataOffset,
              "numDataMaps": len(keys),
          },
      )
      dataMaps = []
      dataBlocks = []
      for tag in keys:
          if tag in ["dlng", "slng"]:
              data = self.data[tag].encode("utf-8")
          else:
              data = self.data[tag]
          dataMaps.append(
              sstruct.pack(
                  DATA_MAP_FORMAT,
                  {
                      "tag": tag,
                      "dataOffset": dataOffset,
                      "dataLength": len(data),
                  },
              )
          )
          dataBlocks.append(data)
          dataOffset += len(data)
      return bytesjoin([header] + dataMaps + dataBlocks)
  
file_path: catboost/contrib/python/fonttools/fontTools/ttLib/tables/_m_e_t_a.py
imports: from fontTools.misc import sstruct
  from fontTools.misc.textTools import bytesjoin, strjoin, readHex
  from fontTools.ttLib import TTLibError
  from .None import DefaultTable
label_desc: Use image node_id 3 for calling the table__m_e_t_a obj's underlying member method code with example usage: obj.compile(ttFont) and returns: bytesjoin